Furnace.



P. S. HARMON.

FURNACE.

APPLIGATION FILED MAR. 25, 1908.

905,872. 7 Patented Dec.8, 1908.

. INVENTOR IIQANK S. HnnMo/v WITNESSES: 0mm a. 9 v

A TTORNE Y5 FRANK S. HARMON, OF NORTHVILLE, MICHIGAN.

FURNACE Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed March 25, 1908. Serial No. 423,078.

To all whom it may concern:

Be it known that I, FRANK S. I-IARMON, a citizen of the United States of America, residing at N orthville, in the county of VVa-yne and State of Michigan, have invented certain new and useful Improvements in F urnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to hot air furnaces for heating purposes, of the inclosed, composite type wherein the fire pot and combustion chamber are set in masonry, and to certain arrangements thereof whereby the entire radiating surface is covered and at the same time the parts are accessible without disturbing the masonry, for inspection, renewal and repairs.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a view partially in vertical section and partially in elevation, of a furnace embodying features of the invention. Fig. 2 is a view in detail, enlarged, of a water back and connections, together with a portion of a front or door casing plate.

Referring to the drawings, the body of the furnace consists of a hollow base 1 preferably cast integrally with ash pit and ash pit door casing 2, a rounded fire pot 3 with any preferred form of grate, not shown, likewise preferably cast integrally, resting on the base, and a cylindrical combustion chamber or drum 4 of cast metal on the fire pot, a one piece smoke dome 5. with central smoke flue 6 bent to extend laterally, closing its upper end. A fire door casing 7 is bolted on the drum and has a hollow rounded rib 8 along one side thereof. A water back 9 is removably secured on the drum over the fire pot with one end in front of the inner end of the hollow rib 8. A rectangular masonry casing 10 incloses the body and is separated by an air space therefrom, with its upper portion contracted as indicated to form a pyramidal top 11 having a central main hot air duct 12, cold air registers 13 being set around the base, preferably in both sides and rear walls. An opening in the front wall large enough to allow the withdrawal of any section of the furnace body is crossed at the top by a lintel or plate 1 1, preferably an angle bar built into the masonry and acting as a support for the upper part of the wall and the top. This opening is closed by a front plate 15 secured as by bolts 16 or the like to the lintel and to the flange of the ash pit door casing 2, which is flush with the outer face of the masonry. A fire door 17 is hinged on the casing as is also an ash pit door 18. Between them is hung a combined man-hole and water pan door 19 through which a water pan 20 adapted to stand on the ash pit casing may be inserted. This man-hole door also permits access to the plate bolts, allowing the removal of the plate without disturbance of the masonry. A swinging cover 21 closes the outer end of the hollow rib 8, through which extend the feed and return pipes 22 of the water back 9 which can be readily placed therein and screwed into place. Any preferred form of regulating dampers and the other necessary accessories are provided, although not shown in detail.

One of the features is the support of the body entirely free from the masonry whereby all radiating surfaces with exception of the doors are exposed only to the air between the masonry and body.

Another feature is the rigidity of the body, its simplicity of construction and great radiating surfaces.

The principal feature is the accessibility of the parts through the manhole door, and the fact that the entire front may be removed and the furnace body members be inspected, repaired or replaced without in any way disturbing the masonry.

Obviously, changes in the construction may be made without departing from the spirit of the invention and I do not limit myself to any particular form or arrangement of parts.

WVhat I claim as my invention is 1. A hot air furnace comprising a substantially cylindrical upright cast iron body consisting of a one-piece ash pit base with laterally extending integral casing having an outer marginal flange, a one-piece fire pot resting on the base, a cylindrical combustion chamber supported by the fire pot, a fire door casing extending laterally therefrom above the ash door casing having a' hollow horizontal rib in the side of the fire door casing, a hollow water back in the chamber above the fire pot, feed and return pipes extending through the rib and entering the water back, a smoke dome closing the upper end of the chamber, a hollow rectangular masonry casing inclosing the pipes extending through the rib and enterbody, separated therefrom by an air space and provided with a central hot air duct in its top, with cold air inlets in the lower part of its walls and with an opening in its Wall adjacent the door casings, a lintel bridging the opening, a front plate closing the opening and having fire and ash doors registering with the ash pit and combustion chamber casings, means securing the plate to the lintel and the ash door casing and a combined man hole and water pan door in the plate whereby access is had to the plate securing means.

2. A hot air furnace comprising a substantially cylindrical upright cast iron body consist-ing of a one piece ash pit base with laterally extending integral casing having an outer marginal flange, a one piece fire pot resting on the base, a cylindrical combustion chamber supported by the fire pot, a fire door casing extending laterally therefrom above the ash door casing having a hollow horizontal rib in the side of the fire door casing, a hollow water back in the chamber above the fire pot, feed and return ing the water back, a smoke dome closing the upper end of the chamber, a hollow rectangular masonry casing inclosing the body, separated therefrom by an air space, a pyramidal top integrally formed in the masonry casing, a central hot air duct integrally formed therewith extending from its apex, cold air registers in the sides and back of the masonry casing at its base, said masonry casing. having an opening in its walls adjacent the fire and ash door casings, a lintel bridging the opening, a front plate closing the opening and having fire and ash doors registering with the combustion cham her and ash pit door casings, means securing the plate to the lintel and the ash door casing and a combined man hole and water pan door in the plate whereby access is had to the plate securing means.

In testimony whereof I afiix my signature in presence of two witnesses.

FRANK S. HARMON. Witnesses C. R. STICKNEY,

OTTO F. DARTHEL. 

